Keyframe interpolation

Press l to load cars and s to save them
Click and drag on the car front to move it
Click and drag the tip of the velocify vector (from the back of car) to adjust its instantaneous speed
Press 0 for linear interpolation, 1 for cubic Bezier, and 2 for pure twist.
Note that the cars turn around their rear axel

Developed by Prof. Jarek Rossignac.